The Ask a Librarian Service will be unavailable on Monday 6 February between 8 and 10 am for a scheduled upgrade. 

The Charles T.P. Ulm collection of historical aviation records, Part 1, 1919-19651919-1962

Set course by aperiodic if Jim cannot fix E.I.C. then by signal tell me to go R or L until we on aperiodic course. Will then check on this steering compass